It's not the fighting that Drake isn't cut out for, at least. It's taking orders. It's obeying when you're told to kill someone who doesn't deserve to die, or being told to protect someone who doesn't deserve to live. He's heard plenty of horror stories of war where the enemy isn't really the evil so despite being an excellent fighter, Drake knows he'd be a terrible soldier.

He doesn't tell Rosita any of that. Just nods, expression gravely serious: yes, he's lost people. And a few times now, he's sacrificed himself.

She doesn't need to hear that, either.